/**
 * Provides requestAnimationFrame in a cross browser way.
 * http://paulirish.com/2011/requestanimationframe-for-smart-animating/
 */

if (!window.requestAnimationFrame) {
  window.requestAnimationFrame = (function() {
    return (
      window.webkitRequestAnimationFrame ||
      window.mozRequestAnimationFrame ||
      window.oRequestAnimationFrame ||
      window.msRequestAnimationFrame ||
      function(/* function FrameRequestCallback */ callback /* DOMElement Element */) {
        window.setTimeout(callback, 1000 / 60)
      }
    )
  })()
}
